Sheet-perforating tool



A. W. ENGEL.

SHEET PERFORATING TOOL. APPLICATION FILED OCT. 13, 1920.

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SHEET-PERFORATING TOOL.

Specification of Letters Patent,

Patented Apr. 4, 1922.

Application filed October 13, 1920. Serial No. 416,702.

vide an improved tool for perforating sheet material by cutting upon an imperforate block, anvil or platen, for producing paper (or other sheet material.) tags, labels, corner bindings, and the like, includingsuch articles as picture-mounting corners and margin holders, and for like purposes. It consists in the elements and features of construction shown and described, as indicated in the claims. f

In the drawings:

Figure 1 is a face or plan'view of a tool embodying this invention. Figures 2, 8 and a are sections at the lines, 2-2, 3-3 aud ti, respectively, showing in elevation the form of the several cutting blades of the device. f

Figures 5, 6 and, 7, are perspective views of several of the blades disengaged from the remainder of the tool.

Figure 8 is a perspective view of the cutter, 2O.

'Figure 9 is a view of the picture-corner mount.

The tool which is shown in the drawings is designed to be used in a die press in which the tool is mounted in the reciprocating head of the press, as a punch and the anvil or platen is mounted in thewfixed bed of the press as a die. The press and the anvil are not shown in the drawings, being unnecessary for the understanding of the construction and mode of use of the tool itself.

The tool comprises a base or back member, 1, adapted to be clamped by its edges in the reciprocating head of the press; bladespacing and positioning plates, 2, 3, l, and 5, so shaped that when assembled on the back plate, 1, the spaces between them correspond to the cross section of the blades or cutting members which are to be mounted in the tool so as to form apart of it; whereby these blades or cutting elements are closely embraced by the spacing plates when the tool is fully assembled. Over the spacing plates there is mounted a retaining plate 6, which preferably is subdivided into several sections for convenience in assembling, but which, as a whole, comprises apertures corresponding to the cross-sections of the several blades and through which these blades protrude for presenting their cutting edges all in one plane, parallel to the planes of the faces of the back plate, spacing plates and retaining plate. The particular design of tool shown in the drawings comprises the blades necessary for cutting a certain form of picture mounting device for securing the corners of pictures to a mounting card or back; and by reason of the form of this particular corner mounting which is such that two of them can be cut from a single rectangular piece Without waste, the tool is constructed and shown for cutting two at a time, and comprises therefore, the blades for severing the two pieces from each other, as well as for cutting the slits and apertures required in each. The tool shown is designed for cutting the picture corner mountings from a strip of the material, and comprises for that purpose blades 15, 15, for

severing the stripicrosswise; blades, 16, 16,

and 17 for making the Z-shaped cut which divides the rectangular. portion cut ofl by the severing blades, into two L-shaped pieces; blades, 18, 19, positioned parallel to each other in each of the L-shaped areas oblique to the sides of the L for cutting two parallel slits required in the paper; and in each of the L-shaped areas, two U-shaped cutters, 20, 20, for cutting, but not-severing, a U- shaped lug, 21, shown in the Figure 9, which represents the picture corner. mount which is cut by the tool. It will be understood that these several blades and their positions are merely illustrative of the invention, and that the invention is not at all confined to the particular form of blades,that is, to blades adapted for cutting any particular outlines or slits or perforations. But the several blades shown as above mentioned, are adapted'to illustrate the invention, particularly in respect to the means of securing the blades in and by the three plates mentioned. This method and means of securement is characterized by the following features: first, that the ends of the blades opposite their cutting edge is lodged against and stopped by the back plate, 1, which for that purpose has a plain face as shown; second, that the several blades are positioned on the back plate and spaced apart, by the several spacing plates which are shaped to conform to the intervals between the lines to be cut in the particular design to be made, taking into account the thickness of the blades, and certain projections or lugs th ereon which protrude with respect to the design or outline to be cut, as hereinafter explained, as means for retaining the blades. The spacing plates are not necessarily completely severed so as to make a separate plate or iece for each distinguishable portion of tie total area of the tool between and beyond the lines of the design, and the blades which cut the design; but, instead, the spacing plates in some instances may be merely apertured for the insertion of the blades through it. In the design shown the total spacing element is subdivided so as to make separate spacing plates corresponding to or including the areas of the two pieces to be cut, the dividing line, therefore, following the course of the strip-severing blades, 15,15, and the Z-shaped course of the three blades, 16, 17 and 16. In the construction as shown, the two spacing plates produced by subdividin at this line are each apertured for the sitting blades, 18 and 19, and for the lug-cutting blades, 20. A third characteristic feature is that the blades are provided with lugs or projections from their edges at their end portions which are embraced between the spacing plates, which lugs are overhung and engaged by the retaining plate in which the apertures for the'blades are less extended than the apertures in or intervals between the spacing plates, to the extent of these lugs.

On the plates, 15, 15, these projections or lugs are shown at 15, on the plates, 16, at 16, on the plates, 18 and 19, as at 18' on the plate, 18, and on the U-shaped blades, 20, at 20. The vertical dimension of these lugs is the thickness of the spacing plates, except as reduced by certain interlocking notches to be hereinafter mentioned; and in all cases the shoulder which terminates the lug at the top is at the plane of the upper surface of the spacing plates, so as to be immediately overhung and engaged by the lower surface of the retaining plate, 6. In th case of blades which meet at an angle for cutting an angular slit or dividing line, as in the case of the blades, 16, 17 and 16, which cut the zig-zag dividing line betweenthe two pieces to be severed, the two bladeswhich meet at the angle are interlocked by a lug as 16" I of one of them engaging a notch as 17 in the other, the lower part of the retaining plate engaging lug of the first blade in that case being cut away for forming the notch forengagement of the lug of the other blade which forms the lower edge of the notch in said other blade. This may be seen in Figures 5, 6 and 7, in which the intermediate blade, 17 is engaged in this manner at both its edges with the blades, 16, 16.

The mode of assembling the tool with the blades mounted and secured in the lates will be obvious, but may be described. pon the face plate, 1, the spacing plates and blades may be assembled in their order, the bottom ends of the blades being entered in the recesses in the edges of the spacing plates when the latter are subdivided for admission of the blades, and the blades being inserted through the apertures in the spacing plates when subdivision is not made, as in the case of the blades, 18, 19 and 20. The spacing plates may then be secured to the base plate by screws, 25, and the retaining plate or plates are then applied above the assembled blades and secured by the screws, 22, 22, and 23, '23, which desirably take throu h the spacing plates and engage the base p ate 1.

An obvious advantage of this construction is the facility with which the individual blades can b handled in sharpenin and the rigidity with which they are he d in the tool as a whole for use, including perfect security against bein either withdrawn or thrust in, as. long as t e retaining plates are held fast by the screws.

1. A erforating-blade-holder for the purpose indicated, consisting of a back plate, a blade'spacing plate, and a blade-retaini plate, in combination with blades whose an s opposite the cutting edges are stop (1 on the back plate, and which are space a art and closely embraced by the spacing p ate, and which have projecting into the zone of the spacing plate, lugs which present abrupt shoulders to the inner side of the retaining plate, and screws which clamp the several plates fiatwise upon each other.

7 2. In the construction defined in claim 1, blades for perforating at two lines of an angle, and for that purpose abutting against each other at a line transvers to the meeting planes of the several plates, said blades having respectively a lug and a notch interlocking at their abutting edges.

3. In the construction defined in claim 1, foregoing, the retaining plate being subdivided along lines which form recesses in the meeting edges of the subdivisions, into which recesses the respective blades enter face-wise and fit, upon assemblin the tool.

In testimony whereo I have'hereunto set my hand at Chicago, Illinois, this 11th day of September, 1920.

. ALBERT W. ENGEL. 

